Dont know for sure. I have been getting them onesy-twosy from Mouser, but I just looked, and apparently I am paying more than you are. I use more Mallory 150's nowdays than orange drops anyway.
These guys seem to be highly regarded, though I have never ordered from them myself. I believe the caps are not genuine Sprague if that makes any difference to you.
http://www.justradios.com/capacitors.html
John